chore(*): update CoreOS to 440.0.0

https://coreos.com/releases/#440.0.0
chore(*/systemd): remove deprecated X-Condition in fleet units
Merge pull request #1845 from carmstrong/remove_deprecated_condition

chore(*/systemd): remove deprecated X-Condition in fleet units
Merge pull request #1844 from carmstrong/coreos-440.0.0

chore(*): update CoreOS to 440.0.0
ref(cache): build Redis from source
docs(installing_deis): remove in-place upgrade documentation
Merge pull request #1852 from mboersma/fix-cache-image

ref(cache): build Redis from source
Update README.md

World's smallest docs typo fix.
Merge pull request #1860 from fmd/patch-1

Update README.md
Merge pull request #1854 from carmstrong/remove_upgrade_documentation

docs(installing_deis): remove in-place upgrade documentation
fix(controller+client): utf-8 encode only string types
chore(utils): move encode to api/utils module
tests(controller): add api test for integer serialization/deserialization
fix(contrib/ec2): use conditional root DeviceName

Fixes #1788
fix(client): fix syntax error in config:list
fix(client): also encode keys which could be int
fix(controller): properly purge domain etcd keys on app deleteion
Merge pull request #1841 from ddollar/ec2-hvm

root DeviceName is conditional on paravirtualization type
Merge pull request #1872 from gabrtv/fix-domain-purge

fix(controller): properly purge domain etcd keys on app deletion
Merge pull request #1871 from gabrtv/fix-config-ints

Fix integer handling when encoding configuration